// 基础类型
let userName: string = "李敏"
let message: string = `Hello,${userName}`

let isBool: boolean = false
let age: number = 18

let u: undefined = undefined
let n: null = null


// 赋值any(任意类型)
let any: any = null
any = "sewsd"
any = true
any = undefined

any.myName
any.getName()